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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d04e663e5352e8f0012e161c9b886834c8d7abe5f8205d1c0f243c028b00f04' 
  AND token = 'x6K5Q5B6vLNlkOHMxb8EzDrVWan9LnCCQPbHzsm2O3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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