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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82c858b2ebcaba60005c571143234a9e409b1bd57e97cac804c4bbd580954cf2' 
  AND token = '1tD0IEfWGSP8JJE7EVNNDSWfDDBqRWV3+6LipNzTrb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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