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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ce763fc75ca62e5742aa5fa062de3c733a311ba202b60eff647130667e6b18f' 
  AND token = 'GYAkMd439yUXz9+Rii8WfNL3yhWfc9b2ZvIgqC9/af8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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