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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd665b5e908a7539f224b04d1b763dd02651d72aa14fe6a03a62011250ccbb211' 
  AND token = 'QknCQUA6c7RUupfrOPoEO13VR2CI/IJOV4YWpHu4qqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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