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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a76323819939ffa0fb9a1db5aeeace4e207d844251845c61b9534afd6cb0509' 
  AND token = 'nGFbElLLqnfBJWsJtEEbf9zBElhFFemiibRMuKVc+d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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