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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3312c8be26a0f9d6d34bb8dc259c442b3c0fd5de2c8bdbc5b950302b2de83922' 
  AND token = '5TtFRdWfUlqs+CSwfz5E7ZFf/mkRxyPaic38/uQLLQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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