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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6363bf7554346b1b9501f08a0f0c3b111023681efc85333823cabb587efdd177' 
  AND token = 'FarEuXXx3cas/3eTU09M0y3zMprKkjs9o52+88PjVdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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