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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aef544a304708dd3635e2edb08aed46c02bcbacef8787bee7fe9114cb9b55202' 
  AND token = 'QxOHN4fXIW8AiyG3+zsvZXOMQMEOYd121KSMOd12M8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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