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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61ab8e356d5a68cc2fcaccf94d0eaab2863279eab0d74058ec3e659cbea809f2' 
  AND token = 'XOeidXQY9BoPwcEtF9WMDnMl7WGvpWQn3WknjHN7D/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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