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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4832e886916906f367529ee5b8824595b0ed3df9bc188874788991beed31f5ea' 
  AND token = 'bmWYviUn5iQr30mbhA6gvswgXGECyi625zlA+dgc4oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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