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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '552de1689bd87606ed2a247a11f98720b916c39c4fea01b7efb332ecf4d84bcf' 
  AND token = 'roD318Inu00uE/IzrehnU/O3bTXM72hiGG2y1RSyj+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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