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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b410ccc21a48bc28eed8a575104de240f3747891b67f472f01a5ee20012b444' 
  AND token = '1ZhGqEcotmC4kTS+pyUrX6Z9XPtgjewwWXpy/v/cgkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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