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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cc3812144e4d6595de3a735546d157598f6578f5204f6a4126944e6742af278' 
  AND token = '/i5Z64611mt6Yv5UnCMBMO8bXQkUJqSkumqPiZYC4Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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