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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f95d5157180be05f2da69fa64c301dd3119c6bd8abf1749203020860fe97a6ca' 
  AND token = 'CHkcwYxN1XwrkxnKhCfayIvpfmTkhA4ZCRcT6/+sbV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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