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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7a0d3e2c5503110d35cb68292a25f813abf78ebdf21aebd0c630475bfbd12ab' 
  AND token = 'WZS+w9iWJUZtpxwmbZ4+xGh/GccAy7NoxhCwymZtV0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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