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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f31709caf13c4606655071be21f7c9b8c4b9d477f6e95c705e0ba3a36d32095' 
  AND token = '1yluQaR0leDjwIhv2brIhtleThX1n2SP+kqCTn3RSB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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