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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e46432d422471f6b3e9d7adb8e344ba2f7c2bacbc88ed3edb0bac5ee26d9b384' 
  AND token = '4DCQy+1dVfhDZ2IJZGCmASrVc96I2mhCYrjZSmVGhFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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