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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b0ff9184f8276aed41ee2b366ba9f031c1a7f2113ff97d659e4e6ef38f41b41' 
  AND token = '+26HIkXirl7H4bHJJFbO5rTMwLkkk/EJn6JMC+sdEzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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