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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32aa64bc189ff3a8871af4bc65234c1329c2868cb823bb551a6d8e044b5d97de' 
  AND token = 'l93SmniNpWFOFgZxerDjw1HOfc9s/rLi3zCmkz8e0WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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