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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1d3be16b4686d9c9e7fe4e48be9caaae4dd32fc8345837af6e0689bacf159e5' 
  AND token = 'In2QC+QCi8bWaVYkW8V+Vf+txqjWIiJj1b2gmXwJcMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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