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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '020092aeff09a34e67a39fe19e6e035a629891442e90db19ac917ca8f1dc88c4' 
  AND token = '4n8Q5v8SlaCR6qCRfxbLHGIdSHSHRnmPPsJAf7kxQLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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