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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9635b80f1318db2ae52aeb05ba95b6b25078cf106ddae1556b87d034c4ba2581' 
  AND token = 'fn9EGH/NF1TafUbd1idgUOOSN9cGyf+gpRazm0xZWlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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