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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9440e414467eb461859df28c891283f42404fa48fb5334ce078394662dbe387c' 
  AND token = 'Vjppm5Tc3Xii5yZXmnU3rrYSrH2ivqLsF2Rxq6R9RjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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