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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21f0aff439f45a03719183537651d2e6e3b377974218db6b670e1b581f2cd142' 
  AND token = 'lELXLrSorn8czcJPcYgGrzumdJ0Wv85556LovlFp9sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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