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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '399e41222c36aa1be18c8c787e7a21ddba89d36732282886d1f7a73ebfa3fd27' 
  AND token = 'fpiRyNb9QiNWtHaAsdIYQq47vJyig323pcPQTet25fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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