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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '454db0a86656b713d3f1992de30641b80eea39832cdd94a365e01de2b8c22c43' 
  AND token = 'O8XlFD8sr34z/FV0PNaTpgoUHF+ccrxFQVLESoATe5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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