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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c668714ab303b7c3acd56550eb0c24cacaed91e7818b2446c65a7dee71e03f47' 
  AND token = 'N8Rbo1Ljy3ZuCpJ+Q5EauLYr5e9qGOnYTfPasBKPSgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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