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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a308c4e5c0edbe070bcce0c532600898317760e34c2811648bac03c8c5079659' 
  AND token = 'jGc0KG0Tz61NG2PQ08JXembcoTUlQNR/madaA9ICPrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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