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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '834c812d79205900c823eefa488e3698c2a465b3682ea76d7bcb9da414cfc5ea' 
  AND token = 'vKinBnobmyk1l1axNlAqxAFyMkAqEwNb0oT5Anuv3NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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