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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '158783b36e43931130275adf1099766b765d3bce00303569c34b157664de3cf7' 
  AND token = 'WbIsTKp/3U+1vd6IeDRCOGS9l3PEHNh+Jt7Lao/MzKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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