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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '418db289303cf68a727c1f4ae08bac3ccb70d05fcf193734125a5717aebfdb00' 
  AND token = 'YHcDU8oURnL+T/V2GR8/CpOmbC21smM/MTUHthCYA0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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