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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c01ed3dbfd1bed628f0491c5ef91dd1c5e17b71921dfb33b789aec02c9d89d0' 
  AND token = 'Mmgq1MeiiEqA2dSsuZWBloElsSHcP6KTftZ/hDIcB9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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