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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '473eaf7200c58d9d6b09c589582202a9e79381230718e1624c88eda1976d1c17' 
  AND token = 'nHxLmVofdOD37BvXH/6C13fkg7WpHdWF7v3SjZ95w9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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