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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87621300587b8221690ffbc11d87df873739caaf2029c2888ec0edc14834d612' 
  AND token = '89lY7tasm1mcAuM3+eh0yR1eACHGgUXtPnCONeVePP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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