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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72e2cbbd56a41bae7abc163dbd73e0e4a264fdcfbb8561700e175d052cd9239b' 
  AND token = '4t7hRH8xeIXcLrNudUsLnhItzt5HRurSQG5J3J18UfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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