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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d07f114dcbdb3023a86ca232bcc45ed80ed9af537769caf7b88045ff7ea2f66' 
  AND token = 'JmAAVSfFXg7Ps0b8Z6GiIQ9oKZ0THH9WUaUitSpcgXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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