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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4aba8f460cb57c556e2ae0d9dc19def1c071805f325a5f065e95f0c5ccb4bbd9' 
  AND token = 'wGuRsQ/cJhPCWDchJ1yLn8MfW8I2GSdsdmEO+2Qj/fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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