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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7137adb2c146d474d6eef0aa4913745ac5e6924ecb45aa0aa7ae2c063f95e5be' 
  AND token = 'eHysblPmoGh7XvO6se0iUtWxBp4AUb2ycdC1VF2g8rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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