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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2346d3ae35ad8ef747dc52c2747ecd3f1ce2be7bc9c564cf58afecad7a9ce4c4' 
  AND token = 'TyPIMnjDERblgAOYNH2ojnDDwGUkiZoO75J6lGUaS6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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