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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8a44e55ed04b8e1d0a9217bca870c0ff5e112196d128039344e6b536c1f78e4' 
  AND token = 'WPVaYMbkmyP8lEuj1ii5DLIiie4ggPDqJPbEngF49Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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