SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ecd8030d6c4d6e0491487f5a42292d241a21df4cc1d3d7328b4ada23ce262f2' 
  AND token = 'ImDjG25/xKwzowJqXX+g/y3RZxnhFO5LwSqn/CPafFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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