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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6c2811a482d5883bd13b55679d471f0f217e35a454d6d1d46f81ed56ce3fa7f' 
  AND token = '3Z5E2aPVfDwHRf+4+S3N2VQSiwWK8bEZKTmJ9BR55e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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