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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da5e81a00b082356b7684cda443a6e7b35b6d8e8970c40ccbab277133201e1bc' 
  AND token = '6UIFP9xy4mpaq1K6P7jJ4kaFkBcuovUjTpC4lJtJ+tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}