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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa95712c30eaff6ee752cb9dcd5c7cf09d6d76b27a1a748641bdd2a17ec3cfa8' 
  AND token = 'nCyj0VY9rAfoGh3ecffJ5IGdEBRBASiAmmvkeczgLzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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