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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9ad7a832b9391a7ae08bf2eb631a2dc0d7aff46d5d888a0dc3f61fd4b5ce99b' 
  AND token = 'Uw2LQ2myQNLIRSEirMoTS1tDbSsccisSagTssPdiD6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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