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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6aef6628b8fc25b83a713b6f963a91ce1aa8999f1c4905ad3cc43b64fccd83a3' 
  AND token = 'usmoP5uzxe1B9K37Mz3lqkD5K/2ADVJWo4bqoxgaSFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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