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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcc1d642e33fa51ef6d9afa054166fdf6306a4084336a2daceab11076f7fb37f' 
  AND token = '/E52nOUVLUCSGqf0i5+Dj6qMOjw4NvgTI8yG3k1jh2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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