SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a514e77d57f225f982f417303150e6a70e6d4408d04f60c09211cc83d824daab' 
  AND token = 'zBikLc3MTODGhdwKcS4jNLNBKpM3Zh/bxKYH62lhBuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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