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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '549b4dda3372a9a12d50e59d95b8f08af5b91fc6023e1c778b61ec7708159310' 
  AND token = 'WyimskEREDYtywdYv/DE2NPAU8/HNJfOtpSvNGPRtRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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