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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc079fe40adadf8a264badf82f285dd61644c1a144ee95c52475480e684b38c1' 
  AND token = 'AfDwSdaGnTzHy1xHz4iHuYJoj/DhtHLzC81YeNfQkkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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