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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '774582bf9f1f8ab0ca18813abe47767ef809f29e3e5ac2e560c4eb11bd15928d' 
  AND token = '6yBG3JksnqezssZulmWf/uG8Rb96SEEW8AAH/yD51qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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