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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '480830937a99aec07364352043b9c8ccf9faf57fb463ca7ab0072c9ed8adb859' 
  AND token = 'GKsQx+LDEy3Zri3MAz3M7uPT50mi+IdFk0aZdhN+JfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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