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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8b58cc020b9a5ef6f9fe179b30c8c3fd90e08ad628f85a3cff3fdf8efec56fa' 
  AND token = 'BLYoEwwVLThNLulja0aN7RyxPanSox8leiNYx/oOEPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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