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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '985dab1777c5031580e1d289828f7281816f4e0e5f90965f4f1b2e9a3155e639' 
  AND token = 'HXPByeVBMNbz8ZSaps1Vb9d+RewioGrUDnwtbES9P7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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