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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3dba797a03bb40eeabc50a696299c10d2144e1cddeb567ad8be97f3155e94724' 
  AND token = 'PMEadgRESwGchcdeclYqWIRwpUassK9iCsbZSsmSe0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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